Diocletian - Wikipedia entry for this Roman Emperor. Diocletian - Information on this ruler from the Catholic Encyclopedia. DIR Diocletian - Offers an essay on this Roman Emperor written by Ralph W. Mathisen of the University of South Carolina. Gaius Aurelius Valerius Diocletianus - Provides an essay looking at the life, rule, and retirement of the Roman Emperor Diocletian. A Roman Palace in ex-Yugoslavia - The "Palace" of Diocletian at Split. Includes picture and commentary. Edicts Against The Christians - Medieval Sourcebook on Diocletian and his laws against Christianity in the Roman Empire.